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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914a8539236d260d986e12b58017acead265fb68034d85fc8a1dede3e515f928' 
  AND token = 'VidcAeITc9Xy4LAbq2uIezKbCs2Qjgee7CdCqfF9Ra0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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