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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37d12c2e2e391bc68ba15fa14a2b024d1b49aafc3f1bf7e620283ffde0598ff' 
  AND token = 'qnscpmXMy2yGGZw8tkpD17JYhotHgi9xJ1shjVAm1GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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