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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532f6e4559218c8ecc3eb4138678b54190e3aa05063be73c93fdadbb2961c802' 
  AND token = 'j2iIahiAa6r2QkfW/rcVzFOQ9GZKYuuU+fFj6w8A0Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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