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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81eecc3a4a55862f379dd5a802fda6c85c9d67c42272fcd2a5d1a9fc0e543810' 
  AND token = 'N/IHMhHUuIhruPk0JtH9ViCadSS22mbJkmZRsEMKBgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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