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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5dea7fbf802705d511677482a687039869397815d3c347b85c1244e3f876ee' 
  AND token = 'YkyedSO3pciP7rEHP6uGPFtxD2lW68wNQaNg4AGKd1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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