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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fab73b6b735172418272e7ce916979f43e9d40d906dbf74528b75eecb50e63' 
  AND token = '1j2XWP75EE/L+Yh5fE2kggqO0tJ90ndtbB707hP/jLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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