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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98f39aac86e5747c4bf0cadd32607fd1cc05851b6a7bc6c7a19802b13a3f4d1' 
  AND token = 'ri3vWv7AM8IQ/Rqyct1+E4LV6jI7ILFizc370Sledvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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