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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8b8ff3c6ae6f9b92e2c9f88bc063b9048a8a01b2cc978327edf5008634b6c7' 
  AND token = 'nlmhWfqZi94NqXq/MDtEI6bjbuWOyOFAXhBOEm8h4us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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