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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e96cd70a3cb618a01f46706e8d01f4295298358504b698700aa892035c586ca' 
  AND token = 'GejXcs2WjUKhBpdHzYnigPaeuA3GnU212d8kzXNUwas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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