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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d576d5a878d402f83fe87dbd1a78b8ad78d6b562b50991863e8ada0bfc7eb71' 
  AND token = 'bun+CTtYnHEOBV6u6mnsMUCrpElWlvb7DhHyM4r2B4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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