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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29a3cf8fa840fa7a0f1669fc864820ac1b98fd7b3c07f6c3f60364d02a4ab88' 
  AND token = 'FYksPLBTW6MtHlEnK/aIzRSFvoLO8Rz1OD/+kjRc3Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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