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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f419bafe2672f319f07472360a935e0e4fbb683e6587599e53b4f0c3a4ac093' 
  AND token = 'ZRGbtGOy3aG4SdkkqSJGIq1InMTKcFP+2DR/s+FvKC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}