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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd92f1b5ff403da7a68a7f89ad22deea0f04edf34195dd0530118ff8ce33e9ef' 
  AND token = 'y2wQ7ai0mHPioOi70Q281ZVNPwIAte6eVX1RY3BvadE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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