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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5877decec8dc91fc2d5d2674d79b4e9f8139df607ce0e3bd72ecff57bce3d8e1' 
  AND token = '/DtKuikjtGdzqZtDHjpT46O8QH5vJWWdZZQGPCpJWJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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