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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2627569a894a5ad9b0ad43cdd4344329ba9b1bba977cccbc986695382a8425f' 
  AND token = 's855cclw8QAcZBCcBusE0TQkSEXqWuV29JVl4z6MVdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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