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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241de1ffd4aa371cae62d775df4bfff75d6259769a5609c6d0d66a1aca7068dc' 
  AND token = 'HItwZ2FsqgX8XWuNvwfYw3ALXiKbMX8nZWZXCE8delc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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