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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae419dbe5bf6d5423d158c76d4e6d99fb2599f0235ca1d0f5988008bf3af8165' 
  AND token = 'oMX3v/Mh0vxL+2wLNlkfU9+CXN1owLiWyh/QeYYitTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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