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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bbc0650ca3ed151b1e5b8cc15add0ee3d4876f84a356b84e3b0292971e8f02' 
  AND token = 'xec0odHwOdeZOSBxb9hrr1ZPDFnK+z7SGXrYZHxqj7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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