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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25653ac168cdcf5a2b7825baa9c8f0a9f1bac262d838b0daee6305239294ef18' 
  AND token = '0rWhmglZzth3fb7n19g0eW3FGsJq9jvZfBEsPY8sYq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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