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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a90abcf02be8d5cfa5a6662274859493e368213827645312fa43028bc3308d' 
  AND token = 'eu135HbLyfeR0EMFhdoktcTO8L3yrKqfVhP/nTV4UIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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