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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4d38c6e3f5233a342f74a4840ca889b6c53cc8305e1a3220129efb521551bd' 
  AND token = 'uK2lXJYHstKbJ2a8kj+j9lz9EoAq1NDwhSSj3W8zpwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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