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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c64ea659c1e766a93173cecdead7c274c07766cf48c702a7bcb57c1f790c7c7' 
  AND token = 'akNZH9+B0Vgt9doB36hJ4VLI3D/3aIXrpOuDmeF3DiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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