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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3086229a0b5ace2662c2f2a565b29c4157c9d425064df4f5ec591cdd15dd1720' 
  AND token = 'rxoR3BB20I7J3q69+RhM0BmTXDj9ESC2f4EJbTkjl44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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