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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c58a7d94f84ae4037ae28af6271f7086a48def053c71dc6e7d1b3d58348303' 
  AND token = 'B9QbyPUJblMIg1SgP/ax2vlTyANIt4hhdDlmkpwvYRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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