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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c672d7d35d2405b41d0c1d8f1148d7307cc56f2abaab1580cc7985d6783b8840' 
  AND token = '8toP29Oj8GDkUT0J8PmXQKP4Ebu9fZy/k2A9ngXJHxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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