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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a829b9bcebc06e689ac563d82ff5eb9f9e05753b7cfdd495b9d8948540bf061' 
  AND token = 'IfQ43NmgEz+2UvA01RQi+13de0chBRSLWf72IcH8yQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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