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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93e4410150cf6eefb75a1188b231995b76d2b956ba87256bd80e93ef5cd5bd2' 
  AND token = 'imyhIEyQ5Ea8DTl9+MHYihgm6SVTP3aqJsIqyftCE6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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