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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b697b1900472a49a587efcf6413ea6f45cd02f7257d65b0b92ccb0c8fee28002' 
  AND token = 'upHtDv2mlcIf3IOpyHltHnsViDXdDfKJudj2cnMlG4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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