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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c0fd70724b099b73e32d4c2203f0b1dbf5aa417bc0b07971abc074e2f7e0d4' 
  AND token = 'X7RPWtt/M9B8LLIkYbD5fOnbwKaYnn+8UFASBLZ+m1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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