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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec1bc66f3785065ab3f8da2663ff217314ba394360bd927a046ff38c7605363' 
  AND token = 'S8UFbFPERWCGRjSWglCn8WzWbS58/iptwY1UyvtTNEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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