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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aeabcc8732cffd459fdd1a0ac250fbe453b632d4119464322024a9dd30019cd' 
  AND token = 'fgVeFynIL8PmccZ7v7XGOIwlG1BvTfoISLCkpLUfEzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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