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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827030e8ba2475f0bfd09a581828247b85eefc98b63fb05478d9d00c20f4744e' 
  AND token = '3Ha039TGhMM2gH5RG0spacXm1T7sCaFvfDJxdYvCDiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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