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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9462ed9a1f0ccfb9274562ce868fcbd867a657fdd4909aa09117360c4505f08c' 
  AND token = '03Zk/t2dn5pvBMerqhOavT9aCyb9k25TOptmZGH7T48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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