SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc095e6fa64d3b55d6fed0c2c77a624d29affdc08324b5c0504ed7b3b4d7938' 
  AND token = 'nkoo//Y4NtLf9e+DmjKI7QKU4qwt4uhPpjYgBXOZOYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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