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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f4df1a6ab39e778f24ec3430501e6e64a1f96c88e4b5fc38df8e3c4a87a325' 
  AND token = 'svv3jZrQUhPIQvnpcHVtK7Xo8voX2oPhtQF1HkI++yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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