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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c4e4ec85d5492d3c03f0b635a7371a89a68e6dee73afd8599d61837151fcff' 
  AND token = 'B5OzPv58j1lgj1I7iaukadwd6U+F785zFMEI8BkSA8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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