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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e955721322577b9bfe5e2cac061b7d80dca10dfdffe8638469746dfd0ccc71' 
  AND token = 'L0OB7ovOtROWv0IlUwLb98r2AarIRjI6X8uQ70TbT74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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