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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd065f8fc8b650948f94266d71041d90482ec7766e8c869623dd4baabbff23e' 
  AND token = '5oE2kRh8XUU8FA6Xzg+ZoW7VodkOSOL85//WIrJo6uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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