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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cf91eac4eba659d251e87820017110ba4a6af8afb738d07fae6e3afa17a63b' 
  AND token = 'Mdo1Xqh5BNiLCMeOipAhiGAQzbT1+n/xAolIKF57RLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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