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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a12c0c77480cebed150973791baa68b3de1827e3c17db6d9fa4ea24fd2304a' 
  AND token = 'L9BNTzYEpRUuNxGTJ/5Obrh5wn5UI1Ong8k1si0e3hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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