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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b90ede5daba092117a5a3095d1f2ec558f4f3f490224a410adde99d22a925b' 
  AND token = 'Z+F0cw7TXBx8qZ1ZQRQLnlfWBp9ihPPoKmPPSwB6rMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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