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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59756c7e7e5679c10a4cf00877032fde337757ef1a25bcb0ffb5a456d90dd8cc' 
  AND token = 'vfIb5NF2WXZcvqltOG14LVUYAIJ+w547wVa9Y5JMuPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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