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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1663ed7e56af2f0eaab0131ef2592b5e65f8fc83399a70e55f0884a4820c690f' 
  AND token = 'bxGsMT2dcTLydw9M/PCAQQc8Q6rOsOlmTAdoM0hThNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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