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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fca6224b7b96a51e0fd5ba01055dc25d302302775b1c2623820da04f156e17' 
  AND token = 'ArvfDX3Yzp2+MIeZzgo5B0Au0o8iDhFmFI8hALTxECw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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