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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d68f92f26f0b57b56476027a212bba68363f1dba9142075c382bb901c35f19' 
  AND token = 'VsIPPNmNFXKLQvIt7gR0ci4RvgKU9I+Gc3Ki5E+U6N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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