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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5778c06a791b4bfc663a66b04b165101eaba7570cb860cc1ddf463c331bbc5' 
  AND token = 'ulpNzt26iYoepqemCu4R9QHJxSshQFNetFXjAMCnCCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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