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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24b78f33948e3f27c2eeb1228fb99b80f999583fec7775b40a70687712dc3cf' 
  AND token = 'koNX2ND7cfVIGByfxHtSapnzm4nxoVBg4lX9CQe6gkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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