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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b38c253730106bb7ac7454fce9392074ef974818be00455cf2ff8dfd019163' 
  AND token = 'BB8dygr4hFONoS5Xf0HGXO87AVqYiY4nS2vcU90q2C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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