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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9074ecdc7998ce0eeeec3f3ba6ad21ae46333429f59f90e08b480c2f8471cca' 
  AND token = 'DI+xpDiH2I56xh5tZKHiqR5rnJkj1HBfema/ikD4FoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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