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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d574b702955e14cbded7e5265551cedd0464f3cb2b81c8c088df2a959d9f22' 
  AND token = 'u9IjsSfW5khDw6W2pr2ch8bnNQlIGIbI4Gf8JiQn2GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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