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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0883abddb0b7e356774748a92dfcec55878956b23e8de00b5c8f5943c70a742' 
  AND token = 'ntcraBwIZvisaCoKRycDEHkbvbmbfUcIjS3K/h4P3Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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