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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bfde6b08ed308c6373e696a2339679a90fe5e93e7c1a396ea7f6432c3d38e4' 
  AND token = 'CDi/0pSYrtld2Ps8CPrvlWH7sOPDw9rHdNFp9IET/W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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