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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2bb6256e908ba8c5ca1ed200a4447af76e75e2d7d2c6386579341f4e9fe134' 
  AND token = 'NF7Pus3e+Kmjwa2c4ptVcTY3KpZDtjfUU3uIoW/XBYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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