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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9595029e3f2da74142b122b8e1f63e1d1e919b7c1d7b493d40f6ba633bfa207c' 
  AND token = '4FwkmEXhvb2uD9+RI9BpbVmrH3o3iVqqJkJLskqQrPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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