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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42044e1c7bfe2a5d68e9a29ef624e6f5eafaca92c1af153422e5327b8c347723' 
  AND token = 'n4tarZekvFIe7MRsjOBPgjklz99Sj9JYiHQtvAzTdEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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