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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055bfee17076b20cab1b6e23447d5acc9df88f1e3888e5e6d44b39c81e4e3b90' 
  AND token = '86vjGfHVcuvPlmmaPUg8SM3M2PDgVDIaT341lMfjpaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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